I Built a Tool That Verifies What AI Agents Actually Did

AI agents can report success for actions that never happened. The trace looks clean, but observability tools often rely on the agent's own account of what happened. So I built Matrix — a tool that checks the real system instead of trusting the agent. For example, if an agent says it sent an email, Matrix checks the actual Gmail mailbox and returns: CONFIRMED — it happened CONTRADICTED — it didn't INCONCLUSIVE — there isn't enough evidence The verdict comes with the evidence behind it. Gmail only for now. Zero users. Day one. I'm building this because AI agents need a way to prove what they actually did — not just report that they did it. Try Matrix: https://matrix-snowy-beta.vercel.app⁠� I'd love feedback from anyone building AI agents: How are you currently verifying agent actions?